CN104850292A - Embedded touch screen, driving method of embedded touch screen and display device - Google Patents
Embedded touch screen, driving method of embedded touch screen and display device Download PDFInfo
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- CN104850292A CN104850292A CN201510293901.9A CN201510293901A CN104850292A CN 104850292 A CN104850292 A CN 104850292A CN 201510293901 A CN201510293901 A CN 201510293901A CN 104850292 A CN104850292 A CN 104850292A
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
- G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
- G06F3/03—Arrangements for converting the position or the displacement of a member into a coded form
- G06F3/041—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means
- G06F3/0412—Digitisers structurally integrated in a display
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
- G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
- G06F3/03—Arrangements for converting the position or the displacement of a member into a coded form
- G06F3/041—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means
- G06F3/0416—Control or interface arrangements specially adapted for digitisers
- G06F3/04166—Details of scanning methods, e.g. sampling time, grouping of sub areas or time sharing with display driving
- G06F3/041661—Details of scanning methods, e.g. sampling time, grouping of sub areas or time sharing with display driving using detection at multiple resolutions, e.g. coarse and fine scanning; using detection within a limited area, e.g. object tracking window
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
- G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
- G06F3/03—Arrangements for converting the position or the displacement of a member into a coded form
- G06F3/041—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means
- G06F3/042—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means by opto-electronic means
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
- G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
- G06F3/03—Arrangements for converting the position or the displacement of a member into a coded form
- G06F3/041—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means
- G06F3/044—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means by capacitive means
- G06F3/0446—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means by capacitive means using a grid-like structure of electrodes in at least two directions, e.g. using row and column electrodes
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F2203/00—Indexing scheme relating to G06F3/00 - G06F3/048
- G06F2203/041—Indexing scheme relating to G06F3/041 - G06F3/045
- G06F2203/04106—Multi-sensing digitiser, i.e. digitiser using at least two different sensing technologies simultaneously or alternatively, e.g. for detecting pen and finger, for saving power or for improving position detection
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Abstract
The invention discloses an embedded touch screen, a driving method of the embedded touch screen and a display device. The embedded touch screen comprises a capacitive touch circuit, a fingerprint recognition circuit and a control module. The capacitive touch circuit is used for judging the position. The fingerprint recognition circuit is used for recognizing a fingerprint in a corresponding area of a photosensitive touch module and generating a recognition signal, and outputting the recognition signal to a fingerprint touch reading line if a fingerprint touch scanning line has a touch scan signal. The control module is used for determining a fingerprint touch area according to a touch position after the capacitive touch circuit determines the touch position, outputting the touch scan signal to the fingerprint touch scanning line corresponding to the fingerprint touch area, and processing the recognition signal output by the fingerprint touch reading line corresponding to the fingerprint touch area. Therefore, fingerprint touch scanning time is shortened, data processing quantity is reduced, and fingerprint recognition time and power consumption are further reduced.
Description
Technical Field
The present invention relates to the field of touch display technologies, and in particular, to an embedded touch screen, a driving method thereof, and a display device.
Background
With the rapid development of display technology, Touch Screen panels (Touch screens) have gradually spread throughout the lives of people. At present, touch screens can be classified according to the working principle: resistive, capacitive, infrared, and surface acoustic wave, electromagnetic, vibration wave, and frustrated total internal reflection optical, among others. Among them, the capacitive touch screen is sought as a new favorite in the industry by virtue of its unique touch principle, high sensitivity, long service life, high light transmittance and the like.
In a personal authentication system based on security of a touch screen, a method of performing fingerprint recognition using a fingerprint recognition device is widely used. At present, the vacant position outside the display area of touch-sensitive screen usually sets up the fingerprint identification module, and then realizes the fingerprint identification function for generally need to carry out fingerprint identification earlier and just can operate during the use, it is not convenient enough, and need carry out the function combination with display device and fingerprint identification device during the manufacturing, it is more loaded down with trivial details.
Therefore, in order to solve the above problems, currently, a reward fingerprint identification area is arranged on a touch screen of a display area, i.e., fingerprint identification and touch control are integrated together. However, in the existing touch screen, fingerprint identification is performed by processing signals on all fingerprint touch reading lines in a display area, and the data size is large, especially for a large-size display screen, the data size is large, so that the fingerprint identification time is long, and the power consumption is large.
Disclosure of Invention
In view of the above, embodiments of the present invention provide an embedded touch screen, a driving method thereof, and a display device, so as to reduce fingerprint recognition time and power consumption of the touch screen.
The embedded touch screen provided by the embodiment of the invention comprises a capacitive touch circuit, wherein the capacitive touch circuit comprises a plurality of capacitive touch electrodes and a touch detection chip which is electrically connected with the capacitive touch electrodes and used for judging a touch position by detecting capacitance value changes of the capacitive touch electrodes; further comprising: the fingerprint identification circuit and the control module; wherein,
the fingerprint identification circuit includes: the touch screen comprises photosensitive touch modules arranged in a matrix, fingerprint touch scanning lines connected with the photosensitive touch modules in a one-to-one correspondence mode, and fingerprint touch reading lines connected with the photosensitive touch modules in the rows in a one-to-one correspondence mode; the fingerprint identification circuit is used for identifying the fingerprint in the corresponding area through the photosensitive touch module and generating an identification signal, and when the control module outputs a touch scanning signal to the fingerprint touch scanning line connected with the photosensitive touch module, the photosensitive touch module outputs the identification signal to the fingerprint touch reading line;
the control module is respectively connected with the capacitance touch circuit, the fingerprint touch scanning line and the fingerprint touch reading line; the control module is used for determining a fingerprint touch area according to the touch position after the capacitance touch circuit determines the touch position, outputting a touch scanning signal to a fingerprint touch scanning line corresponding to the fingerprint touch area, and processing an identification signal output by a fingerprint touch reading line corresponding to the fingerprint touch area.
Preferably, in the in-cell touch screen provided in the embodiment of the present invention, the photosensitive touch module includes a photosensitive unit and a touch reading unit; wherein,
the output end of the photosensitive unit is connected with the input end of the touch reading unit, the control end of the touch reading unit is connected with the corresponding fingerprint touch scanning line, and the output end of the touch reading unit is connected with the corresponding fingerprint touch reading line;
the photosensitive unit is used for generating an identification signal when receiving light and providing the generated identification signal to the input end of the touch reading unit; the light received by the photosensitive unit is light reflected to the photosensitive unit by a built-in light source of the touch screen when a hand contacts the touch screen;
the touch reading unit is used for being in a conducting state when a touch scanning signal exists on the corresponding fingerprint touch scanning line, and outputting the received identification signal to the corresponding fingerprint touch reading line.
Preferably, in the in-cell touch screen provided in an embodiment of the present invention, the light sensing unit includes: a light sensing transistor; wherein,
and the source electrode and the grid electrode of the photosensitive transistor are connected with the reference signal end, and the drain electrode is the output end of the photosensitive unit.
Preferably, in the in-cell touch screen provided in an embodiment of the present invention, the touch reading unit includes: a switching transistor; wherein,
the source electrode of the switch transistor is an input end of the touch reading unit, the grid electrode of the switch transistor is a control end of the touch reading unit, and the drain electrode of the switch transistor is an output end of the touch reading unit.
Preferably, in the in-cell touch screen provided in the embodiment of the present invention, the photosensitive touch module further includes: a capacitor; wherein,
one end of the capacitor is connected with the output end of the photosensitive unit and the input end of the touch reading unit respectively, and the other end of the capacitor is connected with the reference signal end.
Preferably, in the in-cell touch screen provided in the embodiment of the present invention, at least one gate signal line of the touch screen is the fingerprint touch scan line.
Preferably, in the in-cell touch screen provided in an embodiment of the present invention, the control module specifically includes:
the area determining unit is used for determining a fingerprint touch area according to the touch position after the capacitive touch circuit determines the touch position;
a signal output unit for outputting a touch scan signal to a fingerprint touch scan line corresponding to the fingerprint touch area,
and the signal processing unit is used for processing the identification signal output by the fingerprint touch reading line corresponding to the fingerprint touch area.
Preferably, in the in-cell touch screen provided in the embodiment of the present invention, the signal processing unit is configured to compare, for each fingerprint touch reading line corresponding to the determined fingerprint touch area, an identification signal output by the fingerprint touch reading line with an identification signal output by a previous fingerprint touch reading line adjacent to the fingerprint touch reading line, and amplify a signal difference; or comparing the identification signal output by the fingerprint touch reading line with the identification signal output by the next adjacent fingerprint touch reading line, and amplifying the signal difference.
Preferably, in the in-cell touch screen provided by the embodiment of the present invention, the signal processing unit includes at least one differential amplifier.
Correspondingly, the embodiment of the invention also provides a display device which comprises any one of the embedded touch screens provided by the embodiment of the invention.
Preferably, an embodiment of the present invention further provides a method for driving the in-cell touch screen, including:
the capacitive touch control circuit detects a touch control position, and the fingerprint identification circuit identifies a fingerprint in a corresponding area through the photosensitive touch control module and generates an identification signal;
after the capacitive touch circuit determines a touch position, the control module determines a fingerprint touch area according to the touch position and outputs a touch scanning signal to a fingerprint touch scanning line corresponding to the fingerprint touch area;
the photosensitive touch module outputs the identification signal to the fingerprint touch reading line;
and the control module processes the identification signal output by the fingerprint touch reading line corresponding to the fingerprint touch area.
The embedded touch screen, the driving method thereof and the display device provided by the embodiment of the invention comprise a capacitance touch circuit, a fingerprint identification circuit and a control module; the fingerprint identification circuit is used for identifying the fingerprint in the corresponding area through the photosensitive touch module and generating an identification signal, and when a fingerprint touch scanning line connected with the photosensitive touch module has a touch scanning signal, the photosensitive touch module outputs the identification signal to a fingerprint touch reading line; the control module is used for determining a fingerprint touch area according to the touch position after the capacitance touch circuit determines the touch position, outputting a touch scanning signal to a fingerprint touch scanning line corresponding to the fingerprint touch area, and processing an identification signal output by a fingerprint touch reading line corresponding to the fingerprint touch area. Therefore, through the control of the control module, fingerprint touch scanning and signal processing are only carried out on the determined fingerprint touch area by the fingerprint identification circuit, so that the fingerprint touch scanning time can be shortened, the data processing amount can be reduced, and the fingerprint identification time and the power consumption can be further reduced.
Drawings
FIG. 1 is a schematic diagram of an embedded touch screen according to an embodiment of the invention;
FIG. 2 is a schematic diagram of a fingerprint identification circuit according to an embodiment of the present invention;
FIG. 3 is a second schematic diagram of a fingerprint identification circuit according to an embodiment of the present invention;
fig. 4 is a third schematic structural diagram of a fingerprint identification circuit according to an embodiment of the present invention;
FIG. 5 is a fourth schematic diagram of a fingerprint identification circuit according to an embodiment of the present invention;
FIG. 6 is a fifth exemplary diagram of a fingerprint identification circuit according to an embodiment of the present invention;
FIG. 7 is a flowchart illustrating a method for driving an in-cell touch screen according to an embodiment of the present invention.
Detailed Description
The following describes in detail specific embodiments of an in-cell touch panel, a driving method thereof, and a display device according to preferred embodiments of the present invention with reference to the accompanying drawings.
An embedded touch screen provided in an embodiment of the present invention, as shown in fig. 1, includes a capacitive touch circuit 1, where the capacitive touch circuit includes a plurality of capacitive touch electrodes, and a touch detection chip electrically connected to the capacitive touch electrodes and configured to determine a touch position by detecting a change in a capacitance value of the capacitive touch electrodes; further comprising: a fingerprint identification circuit 2 and a control module 3; wherein,
as shown in fig. 2, the fingerprint recognition circuit 2 includes: the photosensitive touch modules 21 are arranged in a matrix, the fingerprint touch scanning lines Scan are correspondingly connected with the photosensitive touch modules 21 in each row one by one, and the fingerprint touch reading lines Read are correspondingly connected with the photosensitive touch modules 21 in each row one by one; the fingerprint identification circuit 2 is configured to identify a fingerprint in a corresponding area through the photosensitive touch module 21 and generate an identification signal, and when the control module 3 outputs a touch scanning signal to a fingerprint touch scanning line Scan connected to the photosensitive touch module 21, the photosensitive touch module 21 outputs the identification signal to a fingerprint touch reading line Read;
the control module 3 is respectively connected with the capacitive touch circuit 1, the fingerprint touch scanning line Scan and the fingerprint touch reading line Read; the control module 3 is configured to determine a fingerprint touch area according to the touch position after the capacitive touch circuit 1 determines the touch position, output a touch scanning signal to a fingerprint touch scanning line Scan corresponding to the fingerprint touch area, and process an identification signal output by a fingerprint touch reading line Read corresponding to the fingerprint touch area.
The embedded touch screen provided by the embodiment of the invention comprises a capacitance touch circuit, a fingerprint identification circuit and a control module; the fingerprint identification circuit is used for identifying the fingerprint in the corresponding area through the photosensitive touch module and generating an identification signal, and when a fingerprint touch scanning line connected with the photosensitive touch module has a touch scanning signal, the photosensitive touch module outputs the identification signal to a fingerprint touch reading line; the control module is used for determining a fingerprint touch area according to the touch position after the capacitance touch circuit determines the touch position, outputting a touch scanning signal to a fingerprint touch scanning line corresponding to the fingerprint touch area, and processing an identification signal output by a fingerprint touch reading line corresponding to the fingerprint touch area. Therefore, through the control of the control module, fingerprint touch scanning and signal processing are only carried out on the determined fingerprint touch area by the fingerprint identification circuit, so that the fingerprint touch scanning time can be shortened, the data processing amount can be reduced, and the fingerprint identification time and the power consumption can be further reduced.
In the in-cell touch screen provided by the embodiment of the present invention, the capacitive touch circuit may be a mutual capacitive type or a self capacitive type, and is not limited again. Specifically, when the capacitive touch circuit is a mutual capacitance type, the capacitive touch electrode includes a touch driving electrode and a touch sensing electrode; when the capacitive touch circuit is a self-capacitance type, the capacitive touch electrode includes only a self-capacitance electrode. Specifically, the structure of the mutual capacitance touch circuit or the self-capacitance touch circuit is the same as that of the prior art, and will not be described in detail again.
In a specific implementation, in the in-cell touch screen provided in the embodiment of the present invention, the fingerprint touch area determined according to the touch position may be an area exactly equal to the touch position, may also be an area slightly larger than the touch position and covering the touch position, and certainly may also be an area slightly smaller than the touch position and covered by the touch position, which is not limited herein.
In a specific implementation, the in-cell touch panel provided by the embodiment of the invention can be applied to a liquid crystal display, and can also be applied to an organic electroluminescence display, which is not limited herein.
Further, in the in-cell touch screen provided by the embodiment of the invention, the in-cell touch screen further includes sub-pixels arranged in a matrix, and gate signal lines located between the sub-pixels in adjacent rows and data signal lines located between the sub-pixels in adjacent columns.
Generally, the density of the touch screen is usually in the millimeter level, and therefore, in the implementation, the arrangement of the capacitive touch electrode in the capacitive touch circuit can be selected according to the required touch density. Since the sub-pixel density of the touch screen is usually in the micron level, one touch point in the capacitive touch circuit corresponds to a plurality of sub-pixels in the touch screen.
Furthermore, because the fingerprint identification circuit is used for identifying fingerprints and has a high precision requirement, the touch density of the fingerprint identification circuit is smaller than that of the capacitive touch circuit, but is generally greater than that of sub-pixels used for displaying in the touch screen, so that one photosensitive touch module in the fingerprint identification circuit can correspond to a plurality of sub-pixels in the touch screen. In a specific implementation, each photosensitive touch module may be respectively embedded in each sub-pixel, and a periodic distribution manner, a distribution density, or a pitch of all the photosensitive touch modules may be designed according to an actual situation, which is not limited herein.
The present invention will be described in detail with reference to specific examples. It should be noted that the present embodiment is intended to better explain the present invention, but not to limit the present invention.
Optionally, in the in-cell touch screen provided in the embodiment of the present invention, as shown in fig. 3, the photosensitive touch module 21 specifically includes a photosensitive unit 211 and a touch reading unit 212; wherein,
the output end of the photosensitive unit 211 is connected to the input end of the touch reading unit 212, the control end of the touch reading unit 212 is connected to the corresponding fingerprint touch Scan line Scan, and the output end of the touch reading unit 212 is connected to the corresponding fingerprint touch Read line Read;
the light sensing unit 211 is configured to generate an identification signal when receiving light, and provide the generated identification signal to an input end of the touch reading unit 212; the light received by the photosensitive unit 211 is light reflected by the hand from a built-in light source of the touch screen to the photosensitive unit 211 when the hand touches the touch screen;
the touch reading unit 212 is configured to be in a conducting state when a touch scanning signal is present on the corresponding fingerprint touch scanning line Scan, and output the received identification signal to the fingerprint touch reading line Read.
Preferably, in the in-cell touch screen provided in the embodiment of the present invention, as shown in fig. 4, the light sensing unit 211 includes: a light sensing transistor T1; wherein,
the light sensing transistor T1 has a source and a gate connected to a reference signal terminal Vref, and a drain which is an output terminal of the light sensing unit 211.
In specific implementation, the operating principle of the photosensitive transistor is as follows: when no touch is generated, the built-in light source of the touch screen directly emits light, no light is irradiated on the photosensitive transistor, no identification signal is output by the photosensitive transistor, when a finger contacts the touch screen, the light emitted by the built-in light source of the touch screen is reflected to the photosensitive transistor by the finger, the light intensity received by the photosensitive transistor is increased, the carrier concentration in the active layer of the photosensitive transistor is increased, and the photosensitive transistor outputs an identification signal to the touch reading unit. And the identification signal output by the photosensitive transistor is related to the light intensity of the light received by the photosensitive transistor, and the stronger the light intensity is, the larger the identification signal output by the photosensitive transistor to the touch reading unit is. Because the finger has unevenness's fingerprint, the luminous intensity that leads to the concave point of fingerprint and the regional that the bump corresponds is different, consequently can judge corresponding position department through judging the size of identification signal whether the concave point of fingerprint or bump.
In specific implementation, part of components of the photosensitive transistor serving as the photosensitive unit can be prepared in the same layer as part of components of the switching transistor in the sub-pixel of the touch screen, so that the preparation can be realized only by changing the composition of each corresponding film layer without adding too many new preparation processes, the production cost is saved, and the production efficiency is improved. In this embodiment, the photosensitive unit may have other structures, which will not be described in detail herein.
Further, in a specific implementation, in the in-cell touch screen provided by the embodiment of the invention, the reference signal terminal may be connected to a common electrode voltage, which is not limited herein.
Preferably, in the in-cell touch screen provided in the embodiment of the present invention, as shown in fig. 4, the touch reading unit 212 includes: a switching transistor T2; wherein,
the source of the switch transistor T2 is the input terminal of the touch reading unit 212, the gate is the control terminal of the touch reading unit 212, and the drain is the output terminal of the touch reading unit 212. In specific implementation, when the switching transistor T2 is in a conducting state under the control of the corresponding fingerprint touch Scan line Scan, the identification signal output by the light sensing unit 211 is output to the fingerprint touch readout line Read, and the control unit processes the identification signal on the fingerprint touch readout line to realize the fingerprint identification function.
In specific implementation, each component of the switch transistor serving as the touch reading unit can be prepared in the same layer as each component of the switch transistor in the sub-pixel of the touch screen, so that a new preparation process is not needed, and the method can be realized only by changing the composition of each corresponding film layer, thereby saving the production cost and improving the production efficiency. Of course, in the implementation, the touch reading unit may have other structures, which are not described in detail herein.
Preferably, in the in-cell touch screen provided in the embodiment of the present invention, as shown in fig. 5, the photosensitive touch module 21 further includes: a capacitance Cp; wherein,
one end of the capacitor Cp is connected to the output end of the photosensitive unit 211 and the input end of the touch reading unit 212, respectively, and the other end of the capacitor Cp is connected to the reference signal terminal Vref. The capacitor Cp is arranged to enable the identification signal generated by the light sensing unit 211 to be maintained at the input end of the touch reading unit 212 for a long time, so as to ensure that the received identification signal can be output to the fingerprint touch reading line Read when the touch reading unit 212 has a touch scanning signal on the corresponding fingerprint touch scanning line Scan.
Specifically, in the embedded touch screen provided in the embodiments of the present invention, the fingerprint touch reading lines may be disposed between adjacent columns of sub-pixels in the touch screen. Furthermore, each fingerprint touch reading line and the data signal line in the touch screen can be arranged on the same layer and are insulated from each other, namely, the fingerprint touch reading line insulated from each other is prepared while each data signal line is prepared. Certainly, the fingerprint touch reading line and the data signal line may also be prepared separately, which is not limited herein.
Similarly, in the embedded touch screen provided in the embodiments of the present invention, the fingerprint touch scan lines may be disposed between adjacent rows of sub-pixels in the touch screen, and each fingerprint touch scan line may also be disposed on the same layer as and insulated from a gate signal line in the touch screen, that is, the fingerprint touch scan lines insulated from the gate signal line are prepared while preparing each gate signal line. Certainly, the fingerprint touch scan line and the gate signal line may also be prepared separately, which is not limited herein.
Optionally, in specific implementation, as shown in fig. 6, at least one Gate signal line Gate of the touch screen may be used as a fingerprint touch scan line, so as to avoid adding a new wiring in the touch screen, which may ensure that the touch screen has a larger aperture ratio, and the Gate signal line is used as the Gate as the fingerprint touch scan line, which may also avoid adding a driver IC for separately controlling the fingerprint touch scan line, so as to save manufacturing cost.
Preferably, in the in-cell touch screen provided in the embodiment of the present invention, the control module specifically includes:
the area determining unit is used for determining a fingerprint touch area according to the touch position after the capacitive touch circuit determines the touch position;
a signal output unit for outputting a touch scan signal to a fingerprint touch scan line corresponding to the fingerprint touch area,
and the signal processing unit is used for processing the identification signal output by the fingerprint touch reading line corresponding to the fingerprint touch area.
Preferably, in the in-cell touch screen provided in the embodiment of the present invention, the signal processing unit is configured to compare, for each fingerprint touch reading line corresponding to the determined fingerprint touch area, an identification signal output by the fingerprint touch reading line with an identification signal output by a previous fingerprint touch reading line adjacent to the fingerprint touch reading line, and amplify a difference between the signals; or comparing the identification signal output by the fingerprint touch reading line with the identification signal output by the next adjacent fingerprint touch reading line, and amplifying the signal difference. So that the relative positions of the pits and the bumps on the fingerprint can be defined.
Preferably, in the in-cell touch screen provided by the embodiment of the present invention, the signal processing unit includes at least one differential amplifier.
In a specific implementation, in the embedded touch screen provided in the embodiment of the invention, at least two adjacent fingerprint touch reading lines may be taken as a group, and the fingerprint touch reading lines belonging to the same group are respectively connected to the same differential amplifier through the control switches. And selecting the identification signal on the fingerprint touch reading line to be compared by using the control switch.
Specifically, taking fig. 6 as an example, all the fingerprint touch reading lines Read are taken as a group, and the fingerprint touch reading lines Read belonging to the same group are respectively connected to the same differential amplifier 32 through the control switch 31.
Further, in a specific implementation, in the in-cell touch screen provided in the embodiment of the present invention, the signal processing unit is generally further configured to generate a fingerprint feature map according to the identification signal on the fingerprint touch reading line, and compare the generated fingerprint feature map with a pre-stored preset fingerprint feature map to implement a fingerprint identification function. The specific implementation of generating a fingerprint feature map according to the identification signal and comparing the fingerprint feature map with a pre-stored preset fingerprint feature map is the same as the prior art, and is not repeated here.
Based on the same inventive concept, the embodiment of the invention further provides a display device, which comprises any one of the embedded touch screens provided by the embodiment of the invention. The display device may be: any product or component with a display function, such as a mobile phone, a tablet computer, a television, a display, a notebook computer, a digital photo frame, a navigator and the like. The implementation of the display device can be referred to the embodiment of the embedded touch screen, and repeated details are not repeated.
Based on the same inventive concept, an embodiment of the present invention further provides a method for driving any one of the in-cell touch screens, as shown in fig. 7, including:
s701, detecting a touch position by a capacitive touch circuit, and identifying the fingerprint in a corresponding area by a fingerprint identification circuit through a photosensitive touch module and generating an identification signal;
s702, after the capacitive touch circuit determines the touch position, the control module determines a fingerprint touch area according to the touch position and outputs a touch scanning signal to a fingerprint touch scanning line corresponding to the fingerprint touch area;
s703, the photosensitive touch module outputs the identification signal to a fingerprint touch reading line;
s704, the control module processes the identification signal output by the fingerprint touch reading line corresponding to the fingerprint touch area.
The embedded touch screen, the driving method thereof and the display device provided by the embodiment of the invention comprise a capacitive touch circuit, a fingerprint identification circuit and a control module; the fingerprint identification circuit is used for identifying the fingerprint in the corresponding area through the photosensitive touch module and generating an identification signal, and when a fingerprint touch scanning line connected with the photosensitive touch module has a touch scanning signal, the photosensitive touch module outputs the identification signal to a fingerprint touch reading line; the control module is used for determining a fingerprint touch area according to the touch position after the capacitance touch circuit determines the touch position, outputting a touch scanning signal to a fingerprint touch scanning line corresponding to the fingerprint touch area, and processing an identification signal output by a fingerprint touch reading line corresponding to the fingerprint touch area. Therefore, through the control of the control module, fingerprint touch scanning and signal processing are only carried out on the determined fingerprint touch area by the fingerprint identification circuit, so that the fingerprint touch scanning time can be shortened, the data processing amount can be reduced, and the fingerprint identification time and the power consumption can be further reduced.
It will be apparent to those skilled in the art that various changes and modifications may be made in the present invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.
Claims (11)
1. An embedded touch screen comprises a capacitive touch circuit, wherein the capacitive touch circuit comprises a plurality of capacitive touch electrodes and a touch detection chip which is electrically connected with the capacitive touch electrodes and used for judging touch positions by detecting capacitance value changes of the capacitive touch electrodes; it is characterized by also comprising: the fingerprint identification circuit and the control module; wherein,
the fingerprint identification circuit includes: the touch screen comprises photosensitive touch modules arranged in a matrix, fingerprint touch scanning lines connected with the photosensitive touch modules in a one-to-one correspondence mode, and fingerprint touch reading lines connected with the photosensitive touch modules in the rows in a one-to-one correspondence mode; the fingerprint identification circuit is used for identifying the fingerprint in the corresponding area through the photosensitive touch module and generating an identification signal, and when the control module outputs a touch scanning signal to the fingerprint touch scanning line connected with the photosensitive touch module, the photosensitive touch module outputs the identification signal to the fingerprint touch reading line;
the control module is respectively connected with the capacitance touch circuit, the fingerprint touch scanning line and the fingerprint touch reading line; the control module is used for determining a fingerprint touch area according to the touch position after the capacitance touch circuit determines the touch position, outputting a touch scanning signal to a fingerprint touch scanning line corresponding to the fingerprint touch area, and processing an identification signal output by a fingerprint touch reading line corresponding to the fingerprint touch area.
2. The in-cell touch screen of claim 1, wherein the light sensing touch module comprises a light sensing unit and a touch reading unit; wherein,
the output end of the photosensitive unit is connected with the input end of the touch reading unit, the control end of the touch reading unit is connected with the corresponding fingerprint touch scanning line, and the output end of the touch reading unit is connected with the corresponding fingerprint touch reading line;
the photosensitive unit is used for generating an identification signal when receiving light and providing the generated identification signal to the input end of the touch reading unit; the light received by the photosensitive unit is light reflected to the photosensitive unit by a built-in light source of the touch screen when a hand touches the touch screen;
the touch reading unit is used for being in a conducting state when a touch scanning signal exists on the corresponding fingerprint touch scanning line, and outputting the received identification signal to the corresponding fingerprint touch reading line.
3. The in-cell touch screen of claim 2, wherein the light sensing unit comprises: a light sensing transistor; wherein,
and the source electrode and the grid electrode of the photosensitive transistor are connected with the reference signal end, and the drain electrode is the output end of the photosensitive unit.
4. The in-cell touch screen of claim 2, wherein the touch reading unit comprises: a switching transistor; wherein,
the source electrode of the switch transistor is an input end of the touch reading unit, the grid electrode of the switch transistor is a control end of the touch reading unit, and the drain electrode of the switch transistor is an output end of the touch reading unit.
5. The in-cell touch screen of claim 2, wherein the light sensitive touch module further comprises: a capacitor; wherein,
one end of the capacitor is connected with the output end of the photosensitive unit and the input end of the touch reading unit respectively, and the other end of the capacitor is connected with the reference signal end.
6. The in-cell touch screen of claim 2, wherein the at least one gate signal line of the touch screen is the fingerprint touch scan line.
7. The in-cell touch screen of claim 2, wherein the control module comprises:
the area determining unit is used for determining a fingerprint touch area according to the touch position after the capacitive touch circuit determines the touch position;
a signal output unit for outputting a touch scan signal to a fingerprint touch scan line corresponding to the fingerprint touch area,
and the signal processing unit is used for processing the identification signal output by the fingerprint touch reading line corresponding to the fingerprint touch area.
8. The in-cell touch screen of claim 7, wherein the signal processing unit is configured to compare, for each fingerprint touch readout line corresponding to the determined fingerprint touch area, an identification signal output by the fingerprint touch readout line with an identification signal output by a previous fingerprint touch readout line adjacent to the fingerprint touch readout line, and amplify a signal difference; or comparing the identification signal output by the fingerprint touch reading line with the identification signal output by the next adjacent fingerprint touch reading line, and amplifying the signal difference.
9. The in-cell touch screen of claim 8, wherein the signal processing unit comprises at least one differential amplifier.
10. A display device comprising the in-cell touch screen of any of claims 1-9.
11. The method for driving the in-cell touch screen according to any one of claims 1 to 9, comprising:
the capacitive touch control circuit detects a touch control position, and the fingerprint identification circuit identifies a fingerprint in a corresponding area through the photosensitive touch control module and generates an identification signal;
after the capacitive touch circuit determines a touch position, the control module determines a fingerprint touch area according to the touch position and outputs a touch scanning signal to a fingerprint touch scanning line corresponding to the fingerprint touch area;
the photosensitive touch module outputs the identification signal to the fingerprint touch reading line;
and the control module processes the identification signal output by the fingerprint touch reading line corresponding to the fingerprint touch area.
Priority Applications (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510293901.9A CN104850292B (en) | 2015-06-01 | 2015-06-01 | A kind of In-cell touch panel, its driving method and display device |
| US15/168,667 US20160349882A1 (en) | 2015-06-01 | 2016-05-31 | In-cell touch screen panel, method of driving in-cell touch screen panel, and display device |
| US16/731,702 US10977476B2 (en) | 2015-06-01 | 2019-12-31 | Dermatoglyphics data acquisition device, acquisition method thereof and display device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510293901.9A CN104850292B (en) | 2015-06-01 | 2015-06-01 | A kind of In-cell touch panel, its driving method and display device |
Publications (2)
| Publication Number | Publication Date |
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| CN104850292A true CN104850292A (en) | 2015-08-19 |
| CN104850292B CN104850292B (en) | 2017-09-29 |
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| CN201510293901.9A Active CN104850292B (en) | 2015-06-01 | 2015-06-01 | A kind of In-cell touch panel, its driving method and display device |
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| CN (1) | CN104850292B (en) |
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